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A direct comparison of X-ray spectral models for tori in active galactic nuclei
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| Zeitschriftentitel: | Monthly Notices of the Royal Astronomical Society: Letters |
|---|---|
| Personen und Körperschaften: | , |
| In: | Monthly Notices of the Royal Astronomical Society: Letters, 448, 2015, 1, S. L53-L57 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
Oxford University Press (OUP)
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| Schlagwörter: |
| author_facet |
Liu, Yuan Li, Xiaobo Liu, Yuan Li, Xiaobo |
|---|---|
| author |
Liu, Yuan Li, Xiaobo |
| spellingShingle |
Liu, Yuan Li, Xiaobo Monthly Notices of the Royal Astronomical Society: Letters A direct comparison of X-ray spectral models for tori in active galactic nuclei Space and Planetary Science Astronomy and Astrophysics |
| author_sort |
liu, yuan |
| spelling |
Liu, Yuan Li, Xiaobo 1745-3925 1745-3933 Oxford University Press (OUP) Space and Planetary Science Astronomy and Astrophysics http://dx.doi.org/10.1093/mnrasl/slu198 <jats:title>Abstract</jats:title> <jats:p>Several X-ray spectral models for tori in active galactic nuclei (AGNs) are available to constrain the properties of tori; however, the accuracy of these models has not been verified. We recently constructed a code for the torus using geant4, which can easily handle different geometries. Thus, we adopt the same assumptions as Murphy & Yaqoob (2009, MNRAS, 397, 1549) and Brightman & Nandra (2011, MNRAS, 413, 1206) and try to reproduce their spectra. As a result, we can reproduce well the reflection spectra and the strength of the Fe Kα line of Murphy & Yaqoob, for both NH = 1024 and 1025 cm−2. However, we cannot produce the strong reflection component of Brightman & Nandra in the low-energy band. The origin of this component is the reflection from the visible inner wall of the torus, and the reflection should be very weak in the edge-on directions under the geometry of Brightman & Nandra. Therefore, the behaviour of the reflection spectra in Brightman & Nandra is not consistent with their geometry. The strength of the Fe Kα line of Brightman & Nandra is also different from our results and the analytical result in the optically thin case. The limitation of the spectral model will bias the parameters from the X-ray spectral fitting.</jats:p> A direct comparison of X-ray spectral models for tori in active galactic nuclei Monthly Notices of the Royal Astronomical Society: Letters |
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A direct comparison of X-ray spectral models for tori in active galactic nuclei |
| title_unstemmed |
A direct comparison of X-ray spectral models for tori in active galactic nuclei |
| title_full |
A direct comparison of X-ray spectral models for tori in active galactic nuclei |
| title_fullStr |
A direct comparison of X-ray spectral models for tori in active galactic nuclei |
| title_full_unstemmed |
A direct comparison of X-ray spectral models for tori in active galactic nuclei |
| title_short |
A direct comparison of X-ray spectral models for tori in active galactic nuclei |
| title_sort |
a direct comparison of x-ray spectral models for tori in active galactic nuclei |
| topic |
Space and Planetary Science Astronomy and Astrophysics |
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http://dx.doi.org/10.1093/mnrasl/slu198 |
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2015 |
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L53-L57 |
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<jats:title>Abstract</jats:title>
<jats:p>Several X-ray spectral models for tori in active galactic nuclei (AGNs) are available to constrain the properties of tori; however, the accuracy of these models has not been verified. We recently constructed a code for the torus using geant4, which can easily handle different geometries. Thus, we adopt the same assumptions as Murphy & Yaqoob (2009, MNRAS, 397, 1549) and Brightman & Nandra (2011, MNRAS, 413, 1206) and try to reproduce their spectra. As a result, we can reproduce well the reflection spectra and the strength of the Fe Kα line of Murphy & Yaqoob, for both NH = 1024 and 1025 cm−2. However, we cannot produce the strong reflection component of Brightman & Nandra in the low-energy band. The origin of this component is the reflection from the visible inner wall of the torus, and the reflection should be very weak in the edge-on directions under the geometry of Brightman & Nandra. Therefore, the behaviour of the reflection spectra in Brightman & Nandra is not consistent with their geometry. The strength of the Fe Kα line of Brightman & Nandra is also different from our results and the analytical result in the optically thin case. The limitation of the spectral model will bias the parameters from the X-ray spectral fitting.</jats:p> |
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| description | <jats:title>Abstract</jats:title> <jats:p>Several X-ray spectral models for tori in active galactic nuclei (AGNs) are available to constrain the properties of tori; however, the accuracy of these models has not been verified. We recently constructed a code for the torus using geant4, which can easily handle different geometries. Thus, we adopt the same assumptions as Murphy & Yaqoob (2009, MNRAS, 397, 1549) and Brightman & Nandra (2011, MNRAS, 413, 1206) and try to reproduce their spectra. As a result, we can reproduce well the reflection spectra and the strength of the Fe Kα line of Murphy & Yaqoob, for both NH = 1024 and 1025 cm−2. However, we cannot produce the strong reflection component of Brightman & Nandra in the low-energy band. The origin of this component is the reflection from the visible inner wall of the torus, and the reflection should be very weak in the edge-on directions under the geometry of Brightman & Nandra. Therefore, the behaviour of the reflection spectra in Brightman & Nandra is not consistent with their geometry. The strength of the Fe Kα line of Brightman & Nandra is also different from our results and the analytical result in the optically thin case. The limitation of the spectral model will bias the parameters from the X-ray spectral fitting.</jats:p> |
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| spelling | Liu, Yuan Li, Xiaobo 1745-3925 1745-3933 Oxford University Press (OUP) Space and Planetary Science Astronomy and Astrophysics http://dx.doi.org/10.1093/mnrasl/slu198 <jats:title>Abstract</jats:title> <jats:p>Several X-ray spectral models for tori in active galactic nuclei (AGNs) are available to constrain the properties of tori; however, the accuracy of these models has not been verified. We recently constructed a code for the torus using geant4, which can easily handle different geometries. Thus, we adopt the same assumptions as Murphy & Yaqoob (2009, MNRAS, 397, 1549) and Brightman & Nandra (2011, MNRAS, 413, 1206) and try to reproduce their spectra. As a result, we can reproduce well the reflection spectra and the strength of the Fe Kα line of Murphy & Yaqoob, for both NH = 1024 and 1025 cm−2. However, we cannot produce the strong reflection component of Brightman & Nandra in the low-energy band. The origin of this component is the reflection from the visible inner wall of the torus, and the reflection should be very weak in the edge-on directions under the geometry of Brightman & Nandra. Therefore, the behaviour of the reflection spectra in Brightman & Nandra is not consistent with their geometry. The strength of the Fe Kα line of Brightman & Nandra is also different from our results and the analytical result in the optically thin case. The limitation of the spectral model will bias the parameters from the X-ray spectral fitting.</jats:p> A direct comparison of X-ray spectral models for tori in active galactic nuclei Monthly Notices of the Royal Astronomical Society: Letters |
| spellingShingle | Liu, Yuan, Li, Xiaobo, Monthly Notices of the Royal Astronomical Society: Letters, A direct comparison of X-ray spectral models for tori in active galactic nuclei, Space and Planetary Science, Astronomy and Astrophysics |
| title | A direct comparison of X-ray spectral models for tori in active galactic nuclei |
| title_full | A direct comparison of X-ray spectral models for tori in active galactic nuclei |
| title_fullStr | A direct comparison of X-ray spectral models for tori in active galactic nuclei |
| title_full_unstemmed | A direct comparison of X-ray spectral models for tori in active galactic nuclei |
| title_short | A direct comparison of X-ray spectral models for tori in active galactic nuclei |
| title_sort | a direct comparison of x-ray spectral models for tori in active galactic nuclei |
| title_unstemmed | A direct comparison of X-ray spectral models for tori in active galactic nuclei |
| topic | Space and Planetary Science, Astronomy and Astrophysics |
| url | http://dx.doi.org/10.1093/mnrasl/slu198 |